Numerical simulation of dynamic elasto visco-plastic fracture using moving finite element method
Numerical simulation of dynamic elasto visco-plastic fracture using moving finite element method
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DOI：
10.3970/cmes.2006.011.091
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发表时间：
2006
影响因子：
2.4
通讯作者：
T. Fujimoto;T. Nishioka
中科院分区：
文献类型：
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作者：
T. Fujimoto;T. Nishioka
在金属材料的动态断裂过程中，部分裂纹随着塑性变形的发生而扩展，在扩展后区域附近存在明显的塑性应变。为了阐明这些动态的非线性断裂过程，提出了非线性裂纹扩展的移动有限元方法。采用T*积分作为参数来估计裂纹尖端的状态。首先，基于纯I型高速加载下断裂的数值结果，讨论了材料黏度和裂纹扩展速度的影响。在混合模式载荷作用下，对不同裂纹扩展速度下的断裂路径进行了数值模拟。在这些数值模拟中，采用最大环向应力准则来预测断裂路径。关键词：非线性断裂，T*积分，移动有限元法，尾迹区，非直裂纹扩展
In the dynamic fracture of metallic material, some cracks propagate with the incidence of plastic deformation, and distinct plastic strain remains near the post-propagation area. In order to elucidate these dynamic nonlinear fracture processes, the moving finite element method is developed for nonlinear crack propagation. The T* integral is used as the parameter to estimate crack tip condition. First, the effect of material viscosity and crack propagation velocity have been discussed based on the numerical results for fracture under pure mode I high speed loading. Under mixed mode loading, numerical simulations for fracture path prediction are demonstrated for various crack propagation velocities. In these numerical simulations, the maximum hoop stress criterion is used to predict the fracture path. keyword: Nonlinear fracture, T* integral, Moving finite element method, Wake zone, Non-straight crack propagation